ПРО ВИЗНАЧЕННЯ ПЛАВНОСТІ ХОДУ БРОНЕАВТОМОБІЛІВ ЧАСТОТНИМ МЕТОДОМ

The development of new types of armored vehicles is impossible without determining the dynamic characteristics that affect their performance. The upgrading of existing armored vehicles leads to a change in the inertial parameters of the hull, the position of the center of mass, the elastic parameters of the chassis and tires, which can lead to a significant deterioration of the dynamic characteristics of the armored vehicle. When moving an armored vehicle on a road with a rough surface, it produces forced oscillations, the value of which depends on the dynamic properties of the vehicle, its speed, and the profile of the road surface. An important feature of the armored vehicle is the smoothness of the ride, which determines the comfort of the crew, affects the controllability of the vehicle, improves the accuracy of hitting the target on the move. Road tests require sections of the road with a hard surface and a special controlled profile length of 250 to 1000 m when driving a vehicle at the speed of 10-90 kph. The characteristics of the road surface are the spectral densities of the microprofile and other indicators that determine the degree of impact of the road on the vehicle. The article analyzes methods for assessing the smoothness of the ride of automotive vehicles. The proposed method for determining the ride smoothness of a vehicle is the frequency method. The dynamic model of free oscillations of the vehicle allows to determine the four frequencies of natural oscillations at full and curb weight. It is recommended to use a low frequency of natural oscillations to assess the smoothness of the ride of the armored vehicle. The calculations were performed for an armored vehicle BRDM-2L1. The results of the calculation allow us to conclude that the proposed theoretical and experimental method can be used at the test stage to assess the smoothness of ride of the armored vehicle, which will significantly reduce the time and cost of its testing.